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'"C <br /> LEARWATE <br /> G R O U P, I N C. (" JU pt, <br /> Environmental Services ' 03 <br /> Mr. Marty Hartzell January 15, 2001 <br /> j CVRWQCB <br /> j 3443 Routier Rd., Ste. A <br /> Sacramento, CA 95827 <br /> f Re: Production Wells within 2,000-feet of Site <br /> f Ruiz Grocery Store, 4491 West Durham Ferry Rd., Tracy, CA <br /> Dear Mr. Hartzell, <br /> This letter transmits the results and compilation of a search for production wells within 2,000 feet of the <br /> referenced underground storage tank (UST) site. The search was performed at the request of Ms. Lori <br /> Duncan of the San Joaquin County PHS/EHD. The results are submitted in support of a request for <br /> regulatory case closure. <br /> Clearwater requested information from the Department of Water Resources (DWR) regarding all <br /> recorded wells within the search area. The DWR reported a total of 12 production wells (including the <br /> known well on-site) within the requested area. All wells are relatively young (i.e installed in 1984 or <br /> later). Because of their youth, all wells have sanitary seals greater than 50 feet deep and most have seals <br /> of at least 100 feet or more. The nearest production well, other than the one located on-site, is an <br /> irrigation well located approximately 500 feet southwest of the former USTs. A summary of production <br /> wells data is included on Table 1. Interpreted well locations are shown on Figure 1. Copies of well logs <br /> are also attached. <br /> It is unlikely that any of the wells have been adverselyimpacted by the contaminants at the site. This <br /> interpretation is based on the following facts: (1) structural sources (i.e. USTs) were removed in 1988, <br />' (2) the extent of the contaminant plume was delineated in all direction by,the mid 1990s, (3) over 7,000 <br /> lbs of gasoline were removed from the subsurface by soil vapor extraction / air sparging, (4) verification <br /> sampling and monitoring indicate that only a trace amount of gasoline remains following remediation, <br /> and (5) the on-site domestic well, located within 10 feet of the former contaminant plume and <br /> significantly closer than the other production wells, was never impacted throughout the'entire life of <br /> investigation and remediation. <br /> 520 Third Street,Suite 104 +Oakland,California 94607 + Telephone 510-893-5160 Fax 510-893-5447 <br /> H <br />